What Causes Excessive Sleepiness in Children?

Causes of excessive sleepiness (hypersomnolence) in children may include disorders of the central nervous system, such as encephalitis or meningitis, or traumatic brain injury. Respiratory conditions—such as pneumonia or upper respiratory tract infections—may also contribute, as may cardiovascular diseases. All these conditions can lead to lethargy and hypersomnolence in children. Given the wide range of potential causes, prompt medical evaluation and treatment are essential if symptoms are severe.